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A generic parser and writer for all ISO 14496 based files (MP4, Quicktime, DCF, PDCF, ...)

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/*  
 * Copyright 2008 CoreMedia AG, Hamburg
 *
 * Licensed under the Apache License, Version 2.0 (the License); 
 * you may not use this file except in compliance with the License. 
 * You may obtain a copy of the License at 
 * 
 *     http://www.apache.org/licenses/LICENSE-2.0 
 * 
 * Unless required by applicable law or agreed to in writing, software 
 * distributed under the License is distributed on an AS IS BASIS, 
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 
 * See the License for the specific language governing permissions and 
 * limitations under the License. 
 */

package org.mp4parser.boxes.iso14496.part12;

import org.mp4parser.Box;
import org.mp4parser.support.AbstractContainerBox;
import org.mp4parser.tools.Path;

import java.util.List;

/**
 * 

4cc = "{@value #TYPE}"

* Tracks are used for two purposes: (a) to contain media data (media tracks) and (b) to contain packetization * information for streaming protocols (hint tracks).
* There shall be at least one media track within an ISO file, and all the media tracks that contributed to the hint * tracks shall remain in the file, even if the media data within them is not referenced by the hint tracks; after * deleting all hint tracks, the entire un-hinted presentation shall remain. */ public class TrackBox extends AbstractContainerBox { public static final String TYPE = "trak"; private SampleTableBox sampleTableBox; public TrackBox() { super(TYPE); } public TrackHeaderBox getTrackHeaderBox() { return Path.getPath(this, "tkhd[0]"); } /** * Gets the SampleTableBox at mdia/minf/stbl if existing. * * @return the SampleTableBox or null */ public SampleTableBox getSampleTableBox() { if (sampleTableBox != null) { return sampleTableBox; } MediaBox mdia = getMediaBox(); if (mdia != null) { MediaInformationBox minf = mdia.getMediaInformationBox(); if (minf != null) { sampleTableBox = minf.getSampleTableBox(); return sampleTableBox; } } return null; } public MediaBox getMediaBox() { return Path.getPath(this, "mdia[0]"); } @Override public void setBoxes(List boxes) { super.setBoxes(boxes); sampleTableBox = null; } }




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